MAX40025EVKIT [MAXIM]
Supply Voltage 2.7V to 3.6V;
| 型号： | MAX40025EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Supply Voltage 2.7V to 3.6V |
| 文件： | 总8页 (文件大小：495K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Evaluates: MAX40025A
MAX40025C
MAX40025 Evaluation Kit
General Description
Quick Start
The MAX40025 evaluation kit (EV kit) is a fully assembled
electrical demonstration kit that provides a proven design
to evaluate the MAX40025 ultra-low 280ps propagation
delay, ultra-low dispersion comparator. The board
provides layout options that allow the input termination to
be easily modified for alternative input terminations. The
comparator outputs are designed to drive low voltage
differential signal outputs (LVDS). The LVDS outputs help
minimize power dissipation and interfaces directly with
high speed interconnect devices, FPGAs and CPUs. The
MAX40025 comparator is ideal for time of flight distance
measurement applications.
Required Equipment
● MAX40025 EV kit
● 6 matched-length SMA cables (preferably up to
18GHz capable), 2 feet, or less, in length
● +3.6V, 100mA DC power supply (V /+SUPPLY)
CC
● High-speed signal generator with differential outputs
capable of generating square waves with < 500ps
rise times. (e.g., HP 8131A)
● High-speed oscilloscope with 50Ω termination
Procedure
This evaluation kit demonstrates the MAX40025CAWT+ in
6-pin wafer-level package (WLP). For other available pin-
compatible option (MAX40025AAWT+), contact factory.
The MAX40025 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on power supply until all connections
are completed.
Features
● Fast Propagation Delay: 280ps (Typ)
1) Set the V
power supply to +3.3V. Disable V
.
CC
CC
2) Connect the negative terminal of the V power supply
CC
● Low Over-Drive Dispersion: 25ps
to the GND pad. Connect the positive terminal of the
(V
OV
= 20mV to 100mV)
V
CC
power supply to the +SUPPLY pad.
● Supply Voltage 2.7V to 3.6V
● 39.4mW at 2.7V Supply
3) Set the signal generator to produce an output
square-wave signal of 100mV differential at a
P-P
frequency of 250MHz with a common mode voltage
of +2.5V. Disable the signal generator outputs.
● Power-Efficient LVDS Outputs
● -40°C to +125°C Temperature Range
Ordering Information appears at end of data sheet.
MAX40025 EV Kit Photo
319-100306; Rev 3; 5/19
MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
4) Connect the signal generator differential outputs to the
edge-mount SMA connector marked INA+ and INA-.
5) Enable power supply. Enable the signal generator.
6) Verify that the supply current is within 5% of 17mA
7) Monitor and verify inputs “IN+ TERM” and “IN- TERM”
with the oscilloscope. The oscilloscope must be
configured for 50Ω input termination.
8) Monitor and verify outputs OUT+ and OUT- with the
oscilloscope. The oscilloscope must be configured
for 50Ω input termination.
Input and Output Termination
Input Termination
Terminating Inputs with a 50Ω Oscilloscope
By default, the EV kit is designed to terminate the inputs
when 50Ω oscilloscope probes are connected to the IN+
TERM and IN- TERM termination SMA edge connectors.
When inputs from a signal generator are connected to
the IN+ and IN- SMA connector inputs, IN+ TERM and
IN- TERM are used to terminate the input signals with
a 50Ω oscilloscope. This enables the input signals to
be observed at the oscilloscope and at the same time
terminates the micro-strip line. Populate R5, R2, R6, and
R3 resistors with 0Ω resistors when operating this way.
Detailed Description of Hardware
The MAX40025 EV kit provides a proven design to evaluate
MAX40025 comparator. The device offers ultra-low 280ps
propagation delay, ultra-low dispersion of 25ps.
When a 50Ω Oscilloscope is Not
Terminated at Inputs
Supply Voltage
The MAX40025 EV kit operates from standard supply
levels +2.7V to +3.6V. Connect the positive and negative
supply voltages (ground return) to +SUPPLY and GND pads,
respectively.
When inputs from a signal generator are connected to the
IN+ and IN- SMA connectors and when it is not desired
to terminate the inputs to a scope, then the 0Ω resistor at
R2 and R3 resistors must be de-populated and the 100Ω
termination resistor must be populated at R1.
Inputs
This is helpful when high-speed devices (TIAs, differential
amplifiers) connect directly to the inputs of MAX40025 for
signal discrimination.
The MAX40025 EV kit provides an efficient and simple
method to evaluate the comparator. The inputs to the
device are from IN+ and IN- SMA connectors. IN+ TERM
and IN- TERM SMA connectors serve as terminating
leads at the input when using an oscilloscope to terminate
and observe the input signal. During this condition R1 is
not populated. When not using IN+ TERM and IN- TERM
connectors, R1 should be populated with 100Ω. The
differential inputs accept input signals in the common
Output Termination
Terminating Outputs with a 50Ω Oscilloscope
By default, the EV kit is designed to terminate the outputs
when a 50Ω oscilloscope is connected to the OUT+ and
OUT- SMA’s. C3 and C4 AC coupling capacitors couple
the outputs to the 50Ω oscilloscope inputs. R4 termination
resistor is not populated in this case.
mode range from +1.5V to V
+ 0.1V.
CC
Outputs
When a 50Ω Oscilloscope is not
terminated at inputs
OUT+ and OUT- SMA connectors access the MAX40025
outputs. Both OUT+ and OUT- output traces are in default
AC- coupled for easy evaluation when connecting to a
50Ω terminated oscilloscope. The outputs OUT+ and
OUT- are 50Ω single-ended characteristic lines either
terminated by an oscilloscope or a subsequent high-
speed device. The outputs are LVDS levels. When
terminating with a scope, the outputs are AC coupled.
When connecting the outputs to an LVDS device such as
an FPGA, replace the AC coupling capacitors C3 and C4
with 0Ω shorts and R4 populated with 100Ω termination
resistor.
When connecting to a subsequent high-speed device
designed to accept LVDS inputs, then C3 and C4
capacitors must be replaced with 0Ω resistor shorts and
R4 resistor must be populated with 100Ω termination.
Maxim Integrated
│ 2
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MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
● Use a 100Ω termination resistor for the LVDS output,
connected directly between OUT+ and OUT-, if prac-
tical. If the termination resistor can’t be located adja-
cent to the outputs, use a 100Ω microstrip between
the output pins and the termination resistor.
Input and Output Delay Compensation
The MAX40025 EV kit provides ease of access to evaluate
the propagation delay of the comparator. The length of
the trace from R2 to IN+ TERM and R2 to IN- TERM is
equal to the length of the trace from differential outputs of
the MAX40025 to the OUT+ and OUT- SMA connectors.
Hence the time taken for the input signal to travel from R2
to IN+ TERM will be equal to the time taken by the output
signal to reach the OUT+ connector, thereby cancelling
delay of the EV kit PCB itself. When terminating input and
output signals with a scope, the delay observed is the
delay of the MAX40025.
● Ensure that there is no parasitic coupling between
the inputs and the outputs. Such coupling serves as
feedback and can result in oscillation.
● Minimize any parasitic layout inductance.
Test Setup
Note that a test setup optimized for high-speed measure-
ment is essential to observe the true performance of the
MAX40025 device. Use matched SMA cables for the
differential inputs and outputs. Also, account for the time
delay and skew of the test setup. For accurate measure-
ment of the device’s rise and fall times, an oscilloscope
with a bandwidth several times larger than the maximum
signal frequency must be used.
Layout Guidelines
● Use a PCB with a low-impedance ground plane.
● Mount one or more 10nF ceramic capacitors between
GND and V , as close to the pins as possible.
CC
● Multiple bypass capacitors help to reduce the effect
of trace impedance and capacitor ESR.
● Choose bypass capacitors for minimum inductance
and ESR.
Ordering Information
PART
TYPE
MAX40025EVKIT#
#Denotes RoHS compliant.
EV Kit
Maxim Integrated
│ 3
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MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
MAX40025 EV Kit Bill of Materials
DNI/DN
P
ITEM
REF_DES
QTY
MFG PART #
MANUFACTURER
VALUE
DESCRIPTION
EVK KIT PARTS; MAXIM PAD; WIRE;
NATURAL; SOLID; WEICO WIRE;
SOFT DRAWN BUS TYPE-S; 20AWG
CAPACITOR; SMT (0402);
CERAMIC CHIP; 100PF; 50V; TOL=5%;
TG=-55 DEGC TO +125 DEGC; TC=C0G
CAPACITOR; SMT (0402); CERAMIC CHIP;
0.1UF; 50V; TOL=10%; TG=-55 DEGC TO
+125 DEGC; TC=X7R
CAPACITOR; SMT (0402); CERAMIC CHIP;
2.2UF; 35V; TOL=20%; MODEL=C SERIES;
1
GND, +SUPPLY
-
3
9020 BUSS
WEICO WIRE
MAXIMPAD
100PF
C0402C101J5GAC;NMC0402NPO101J;
CC0402JRNPO9BN101;GRM1555C1H101JA01;
C1005C0G1H101J050;CGA2B2C0G1H101J050BA
KEMET;NIC COMPONENTS CORP.;
YAGEO PHICOMP;MURATA;TDK;
TDK
2
3
4
C1
C2-C5
C6
-
-
-
1
4
1
CGA2B3X7R1H104K;C1005X7R1H104K050BB;
GRM155R71H104KE14;GCM155R71H104KE02
TDK;TDK;MURATA;MURATA
0.1UF
C1005X5R1V225M050BC
TDK
2.2UF
TG=-55 DEGC TO +85 DEGC; TC=X5R
CONNECTOR; FEMALE; SMT;
SMA JACK PCB; RIGHT ANGLE; 2PINS
INDUCTOR; SMT (0402); FERRITE-BEAD;
5
6
J1-J6
L1
-
-
6
1
32K243-40ML5
ROSENBERGER
MURATA
32K243-40ML5
BLM15PX601SN1
600
600; TOL=+/-25%; 0.9A
MACHINE FABRICATED; ROUND-THRU
7
8
9
MH1-MH4
R2, R3, R5, R6
U1
-
-
-
4
4
1
9032 KEYSTONE
9032 HOLE SPACER; NO THREAD; M3.5;
5/8IN; NYLON
RESISTOR; 0402; 0 OHM; 5%; JUMPER;
0.063W; THICK FILM
RC0402JR-070RL; CR0402-16W-000RJT
MAX40025
YAGEO PHYCOMP;VENKEL LTD.
MAXIM
0
EVKIT PART-IC; MAX40025;
PACKAGE OUTLINE: 21-100183;
PACKAGE CODE: N60G1+1; WLP6
PCB:MAX40025
MAX40025
PCB
10
11
PCB
-
1
0
MAX40025
CRCW0402100RFK; 9C04021A1000FL;
RC0402FR-07100RL
MAXIM
VISHAY DALE;PANASONIC;
YAGEO PHYCOMP
RESISTOR; 0402; 100 OHM; 1%;
100PPM; 0.063W; THICK FILM
R1, R4
DNP
100
TOTAL
26
Maxim Integrated
│ 4
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MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
MAX40025 EV Kit Schematic
3
2
3
2
A 2
B 2
2
3
2
3
2
3
2
3
Maxim Integrated
│ 5
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MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
MAX40025 EV Kit PCB Layout Diagrams
MAX40025 EV Kit—Top Silkscreen
MAX40025 EV Kit—Top
MAX40025 EV Kit—GND2
MAX40025 EV Kit—GND3
Maxim Integrated
│ 6
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MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
MAX40025 EV Kit PCB Layout Diagrams (continued)
MAX40025 EV Kit—Bottom
MAX40025 EV Kit—Bottom Silkscreen
Maxim Integrated
│ 7
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MAX40025 Evaluation Kit
Evaluates: MAX40025A
MAX40025C
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
2/19
2/19
3/19
5/19
0
1
2
3
Initial release
—
Updated Quick Start, Detailed Description of Hardware, and Ordering Information
Updated title of data sheet and General Description
Added MAX40025A
1–3, 5
1–8
1–8
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are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
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Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2019 Maxim Integrated Products, Inc.
│ 8
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